摘要
1986～1988年在田间以人工接种小区发病的方法研究了小麦条锈病、叶锈病和白粉病混合浸染与小麦产量损失之间的关系。这3种病害在小麦拔节后混生主要导致千粒重下降,其次为穗粒数减少,对成穗率没有明显影响。病害混生时各生育阶段的总病情(各种病害病情指数之和)与产量损失之间的相关性此同期各种病害单独发生时的相关性偏低,但病情与产量损失最密切的生育期都在灌浆期。灌浆中期3种病害病情发展均趋于稳定,此时,它们的损失当量最具有代表性和可比性。用3种病害各自的损失当量和数理统计的方法进一步分析表明,3种病害混合发生引致的总产量损失可视为各种病害单独发生所引致产量损失之和。
The effect of wheat yellow rust(Puccinia striiformis),leaf rust(P.recondita)and powdery mildew(Erysiphe graminis)together on yieldloss was detailedly studied in field plot experiments in 1986—1988.Whenthree diseases injured wheat together after elongating stage,they wouldresult in decrease in 1000-kernal weight and reduction of grain number perhead.There was no evident effect on the number of heads per plant.Thecorrelation coefficients between total disease indices(the sum of diseaseindices of three diseases)and yield losses were lower than those betweendisease indices of each independent disease and its yield losses.But the keystage(milk stage)in which the disease indices were the most closelycorrelated with yield loss was not altered.The disease indices of threediseases tended to stop developing at the milk stage;at this time the lossequivalent of each disease wes representable and comparable.The total yieldloss due to three diseases together was basically equalled the sum of the yieldlosses due to each disease independently.This study not only provides thescientific basis for establishing wheat disease integrated management system,but also explores the methodology for researching the relationship betweencrop and pests or among pests.
出处
《河南农业大学学报》
CAS
CSCD
1990年第3期340-345,共6页
Journal of Henan Agricultural University
关键词
小麦
条锈病
叶锈病
白粉病
病害
wheat
yellow rust
leaf rust
powdery mildew
yield loss
loss equivalent
